18199378020 has 24 divisors (see below), whose sum is σ = 50958258624. Its totient is φ = 4853167456.

The previous prime is 18199377983. The next prime is 18199378031. The reversal of 18199378020 is 2087399181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151661424 + ... + 151661543.

It is an arithmetic number, because the mean of its divisors is an integer number (2123260776).

Almost surely, 2^18199378020 is an apocalyptic number.

18199378020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18199378020 is an abundant number, since it is smaller than the sum of its proper divisors (32758880604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18199378020 is a wasteful number, since it uses less digits than its factorization.

18199378020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303322979 (or 303322977 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 18199378020 in words is "eighteen billion, one hundred ninety-nine million, three hundred seventy-eight thousand, twenty".